Dunno if these are ideal or right or what, but it's what I get on my truck.

Trans temp - 60-80 above ambient temps read at the test port on the transmission (+10 to +15 higher from computer) when unloaded and no trailer. add 10-20 more when loaded or with trailer. Recent reman HD 4R100 transmission, so unless they gave me a bad transmission, that should be about right.

Coolant - around 193 plus or minus 10 when warmed up. slightly higher when loaded or towing. I have a 193 temp thermostat, so this seems reasonable to me.

Oil - +0 to +10 over coolant. Also seems reasonable. The oil is cooled by the coolant, if the oil temps should be lower than coolant, I'd assume they would cool it some other way.

I was wondering the same thing. I just bought the Insight CTS as well and I don't know what "normal" temps are for all of these readings.

The EGT probe is an add on part to the Insight. You'd know if you had it because you would have to drill and tap the intake manifold to place the probe in the right spot to get the reading. It also uses a separate plug on the back of the CTS unit that is separate from the OBDII plug.

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